Vocabulary
The tendency of an object to resist a change in motion.
What is intertia?
Ms. Moore rolled a marble across the floor to Mr. Young What force started the ball rolling? (balanced force, unbalanced force, gravity, friction)
What is an unbalanced force?
What is the speed of a runner who travels 50 meters in 10 seconds?
What is 5 m/s?
This is the force that acts on a space shuttle as it accelerates toward Earth.
What is gravity?
A car is traveling at 60 mph on a circular track. Is its speed constant? Is its velocity constant? Explain.
ts speed is constant, but its velocity is not because its direction is constantly changing?
What is contact force?
Which will experience more acceleration when the same force is applied, a 10kg object or a 5kg object?
What is the 5kg object?
Friction is a force caused by___________.
What is surfaces rubbing against one another?
The first part of Newton's First Law of Motion states: An object ___ ______ tends to _____ ____ ____ unless acted upon by an ________ _______.
What is at rest, remain at rest, and unbalanced force?
A ball is dropped from a cliff. What is its acceleration due to gravity?
What is approximately 9.8m/s2?
The rate at which the speed or direction of an object changes over time.
What is acceleration?
What is needed to give a boulder acceleration?
A large force that changes the boulders speed/direction.
Jamal was investigating the use of magnets to move objects. He observed that some objects moved toward the magnets without having to touch them. Jamal's observation can be described by saying that the magnets have what type of force?
What is non-contact force?
The second half of Newton's First Law of Motion states: An object in _______ in a straight line tends to ______ _____ _______ in a straight line unless acted upon by _____________ __________.
What is motion, stay in motion, another force (or outside force)?
A bus accelerates from rest to 15 m/s in 5 seconds. What is its acceleration?
What is 3 m/s2?
Mrs. McDow's 8th grade class and Mr. Amazan's 8th grade class challenged each other to a game of tug-of-war. Each class grabbed onto different ends of the long rope (Mrs. McDow's to the left and Mr. Amazan's to the right). Mrs. McDow blew a whistle and both teams began to pull and pull. Mrs. McDow's class pulls with a force of 215N and Mr. Amazan's pulls with a force of 180N. What is the unbalanced force?
35N to the right
Mrs. McDow's 8th grade class and Mr. Amazan's 8th grade class challenged each other to a game of tug-of-war. Each class grabbed onto different ends of the long rope (Mrs. McDow's to the left and Mr. Amazan's to the right). Mrs. McDow blew a whistle and both teams began to pull and pull. Neither team could pull the other team over. Give a statement about the forces involved in the tug-of-war between the two 5th grade classrooms. "The forces were ___________ because _______________."
What is (something like) "the forces were balanced because the teams could not pull each other over"?
You can describe an object sitting at rest on the ground as follows: The ______ of the object on the ground is _________ with the ________ of the ground on the object.
What is force, balanced, and force?
A bicyclist is riding a bike. The cyclist drives 10 km in 1 hour, 15 km in 1 hour, and 25 km in 3 hours. What is the average speed for this cyclist?
What is 10 km/hr?